(2)  
The TAI valve can be manually set and locked in one of two positions (VALVE LOCKED PART OPEN or VALVE LOCKED CLOSED) by a manual override assembly and an engraved locking plate. These are installed at the top of the valve and do not move or operate when the valve is in the normal position.

 (3)  
The manual override assembly consists of a jackscrew that operates a tongue. When the valve is in the normal position, the long end of the tongue points up and can be seen at the top of the valve. The opposite end of the tongue engages with a slot in the engraved plate. When the valve is in the locked position, the long end of the tongue points down and engages with the slot at the top of the valve. The opposite end of the tongue engages with one of the two slots in the engraved plate that lock the valve (Fig. 1).

 (4)  
To lock the valve, the manual override assembly and engraved plate are removed, turned through 180 degrees, and then the override assembly is put back on the valve with the tongue engaged in the slot at top of the valve. This permits you to manually position the valve with the jackscrew until it aligns with the applicable slot in the engraved plate. The engraved plate is then installed on top of the override assembly, and is used to lock and show the manually set position of the valve.

 (5)  
RB211-535E4 SERIES ENGINES WITH THE TAI VALVE POSITION SWITCH; A valve position switch is installed at the top of the engine TAI valve and below the manual override assembly and the engraved locking plate. During the normal valve operation, an extension lever of the valve position switch engages with the slot at the top of the valve, and moves with the valve.

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 30-21-00
 ALL  ú ú 01 Page 1 ú Sep 20/94

A

757
MAINTENANCE MANUAL

HP2 BLEED ENGINE INLET THERMALTHERMAL AIR SUPPLY ANTI-ICE (TAI) DUCTANTI-ICE ENGINEMANIFOLD P1 PROBE
ENGINE INLET THERMAL
ANTI-ICE (TAI) VALVE

SEE A
PRESSURE  1  TONGUE 
SWITCHES 
INLET  PRESSURE 
COWL  BLOW-OFF  SCREW 
TAI PRESSURE  DOOR  JACK 
INDICATOR  3 
4 
2 

SEE B
POSITION INDICATOR
TAI VALVE IN NORMAL POSITION
A
POSITION INDICATOR
ENGRAVED2 2
LOCKING SCREW
PLATE JACK
TONGUE
FLOW
FLOW
VALVE MANUALLY LOCKED CLOSED VALVE LOCKED PARTIALLY OPEN MANUAL VALVE POSITIONING B
1
ENGINES WITHOUT RR SB 30-9534 2
ENGINES WITH RR SB 30-9534 3
ENGINES WITHOUT RR SB 71-9634 4
　
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本文鏈接地址：757 AMM 飛機維護手冊 防冰和排雨 CHAPTER 30 - ICE AND RAIN PROTECTION(45)